Most of those speed enhancers aren't that great and I've found at times they actually can add a bit more latency to the connection as they have a tendency to over saturate the data flow.

Agreed. I don't use either of the proprietary speed enhancers either, but felt it was important to point that out so that the OP didn't spend extra money on the "extreme-N" router thinking that he'd get the boost with a linksys nic.